Joint breaker



March 2 1,575,483 F. J. HINDERLITER JOINT BREAKER Filed Oct. 1 :5

Patented Mar. 2, 1926.

PATENT OFFICE.

FRANK J. HINDERZITER, OFTULSA, OKLAHOMA.

JOINT BREAKER.

Application filed. 0mm 5, 1923. Serial No. 666,708

7'0 all 20. mm it may concern:

Be it known that I, FRANK 1.1111112, a citizen o'f the United States, and a resident of the city of Tulsa, in the county of Tulsa and State of Oklahoma, have invented certain new and useful Improvements in a Joint Breaker; and I do hereby declare that the following isafull, clear, and

exact description of the same, reference being had to the accompanying drawings'and to the numerals of reference marked there on, which form a part of this specification. This invention relates to a omt breaker, and is an improvement over the ]oint breaker shown in my pending application, Serial No. 536,067 filed Feb. 13, 1922. In the joint breaker disclosed in said pending applicatiomthe line of thrust or force was not always applied so as to be normal to the wrench handle, and it has been found that in some instances a part of the applied force was ineffective. The ineffective component of force sometimes tends to produce an outward or lateral strain upon the jack screw,

' and in cases of a very tight joint this inetiective lateral component. of force would be lost. To overcome this objection, I have provided a jack screw in'connection with a joint breaker, so that substantially all of the applied force will be delivered in a direction substantially normal to the wrench handle, whereby the liability of the ruptureof parts is eliminated.

lVith these and other advantages in view,

which will become more apparent in the following description and disclosures in the drawings, this invention comprises the novel mechanism and combinations hereinat'ter described. and more particularly pointed out and defined in the appended claims.

In the accompanyingdrawings which illustrate a preferred embodiment of this in vention and in which similar reference numerals refer to similar features in the different views;

Fig. 1 is a prespective view of my improved joint breaker illustrating its practical application.

2 is a fragmentary top plan view of the joint breaker. Y

J. IIINDER- Fig. 3 is an enlarged front elevational view of the jack screw with the'guidjing track shown insection. a

Fig. 4 is an enlarged sectional view through the power jack.

In referring'to the drawings, there is illustrated a supporting platform 1 upon which an arcuate rack 2 is positioned. This rack is in the form of a T-rail having lower supporting flanges and an upper T-shaped head. The upper surface of the rack is provided with ratchet-teeth, except for a short space at one end which, is substantially smooth. 1 An abuti'i'rent or ratchet stop 3 is supported upon the toothed portion of the rack and may be aojusted thereon byn'ieans ot' a pawl and lover, as is well known in the art.

A jack shaft support a having a T-shaped' groove in its bottom for receiving the T head of therack, maybe a'djustably anchored upon the smootlrportion of the rack by set screws or in anyother manner. A-

hollow bearing 5 integral with or secured to the support 4 extends thereahove. The longitudinal axis of this bearing is offset at an angle to the base support Land the rack, as illustrated in Figure 4, for a purpose to be later explained. An internally threaded sleeve 6 is secured within the hearing 5 and a screw threaded jack shaft 7 is threaded in said bearing with its forward end projecting inwardly of the rack. The

the longitudinal axis of the screw shaft and is adapted for engaging the part to be moved so that the thrust or force will be delivered in the axial line of the screw shaft.

In the drawing there is shown a drilling tool or rod '11 having a joint which it is desired to break. This tool extends through an aperture in thejbase 1 at substantially the center of the arcuate rack 2. A pair of wrenches 12 are secured uponthe tool at an angle toeach other, with one above and the handles of these wrenches extend over the" arcuate rack. In operation, the stop 3 is adjusted upon the rack to bring one wrench handle into engagement therewith and the other into engagement with the bifurcated head of the screw shaft. Then by rotating the screw shaft through the lever 13 the said shaft is advanced, causing thereby rotation of the wrench which is in engagement therewith for breaking the tool joint as is well known. After the joint is broken, the abutment 3 may be used to u-ncoup'le the parts; As the axis of the screw shaft is normalt-o the wrench handle, allof the applied power will be effective in forcing the wrench as desired. It is evident that as the screw shaft 7 is rotated, the angles between it and the wrench will vary, since the screw moves in a straight line .while the wrench rotates in a circle. It is therefore impossible to always maintain the axis ofthe screw at exact right angles to the wrench handle. However, as the length of movement of the screw shaft is very slight, the axis of the screw shaft will not deviate appreciably from the normal, and the partsare designed to force maximum prezsure against the wrench handle. According to this invention, thebearing 5 is so arranged or at such an angle with respect to its base that the engaging point 10 on the head of the jack shaft 7 will engage the wrench at substantially right angles at the maximum load. When the screw shaft is in its initial inward positionit will be practically but not exactly at right'angles' to the wrenchhandle, the inner angle that it makes with the wrench will be slightly obtuse. However, as the screw shaft is rotated and advuiced, this obtuse angle will decrease so that the line of force' will be at right anglessubstantially atthe time thatthe maximum force is exerted to break the joint. During the initial rotation of the jack screw, whatever slack exists is first taken up,.then the resiliencyor yieldof the metal is taken up, so that the maximum breaking force will be exerted after the screw shaft has been slightly advanced, and at this point it is contemplated that the s rew shaft shall be substantially normal to the wrench it operates in order to avoid the in tense lateral strains that might tend to nipture the ack screw sup-port. The proper application of the pressure as will be appreciated, is of great importance in VlBW of the fact that in breaking large joints such as are now quite common, a great deal of power is necessary within a restricted space; as much as thirty ton precsureon the wrench handles is s ometimes required.

From the foregoing, it will be apparent that by arranging the ack screw so that it will be substantially normalto the wrench handle at maximum loadjsubstantially all of the applied force will be effective for turning the wrench and no objectional lateral force will exist to rupture parts of the device. It should also be apparent that as the necessary force to rotate the jack shaft 7 becomes greater, the nearer the obtuse angle approaches a right angle. That is, as the force increases and rotates the wrench, the effective component of force increases.

I am aware that numerous details of construction may be varied through a wide range without departing from the principles of this invention,and I therefore do not purpose limiting the patent granted otherwise than necessitated by the prior art.

I claim as my invention:

1. In a joint breaker, an arcuate rack, an adjustable abutment thereon, a support upon said rack, a screw threaded bearing arried by said support and arranged at an angle thereto, a screw threaded jack shaft supported in said bearing and adapted for engaging substantially at right angles a wrench pivotally anchored at the center of the arc defined by said rack, when the applied force is substantially at a maximum."

In a joint breaker, an arcuate ack, an adjustable abutment thereon, a threaded bearing anchored upon said rack, the axis of'said bearing being arranged at a horizontal, angle to said rack, and a screw threaded jack shaft supported in said bearing and adapted for, normally engaging at right angles a wrench pivotally anchored at the center of said rack at substantially the time of maximum load. i

3.'In a' joint breaker, an arcuate rack, an adjustable abutment thereon, a jack screw rotatably supported upon said rack and having its operative end extei'iding inwardly of the rack for initially engaging a pivotally mounted wrench handle at an obtuse angle, and means for rotating and advancing sald shaft whereby said obtuse angle is decreased to a right angle at mare imum load.

-11. In a joint breaker, an arcuate rack, an adjustable abutment thereon, a screw threaded jack shaft supported upon said rack in opposed relation to said abutn'ie'nt, said jack shaftbeing arranged at an angle to said rack and being provided with a rounded V-shaped end for the purpose set forth.

5. Ina joint breaker, an arcuate rack, an adjustable abutment thereon, a housing adjustably anchored to said rack, a bearing in said housing having an axis extending at a transverse angle to said rack, and a jack screw threaded in said bearing.

6'. In a jointbreaker, an arcuate rack, an abutment secured upon said rack, a support upon said rack in opposed relation to said abutment, and a screw threaded jack shaft carried by said support, said jack shafthav screw ing an axis obliquely intersecting said rack.

7. In a joint breaker, a base. having an arcuate groove for receiving an areuate member, a cylindrical housing carried by said base at a transverse angle to said base and a jack shaft threaded in said cylindrical member.

8. In a joint breaker, a base having an arcuate groove, a cylindrical housing carried by said base, the axis of said housing inter- 10 secting said groove at an angle and a jack shaft threaded in said housing.

In testimony whereof I have hereunto subscribed my name.

FRANK J. HINDERLITER. 

